Defense Secretary Ash Carter and Air Force Gen. Paul J. Selva, vice chairman of the Joint Chiefs of Staff, render honors as the national anthem plays during a remembrance ceremony at the Pentagon Memorial, Sept. 11, 2015. Family members who lost loved ones attended the ceremony, which honored the memory of those killed in the 9/11 terrorist attack. DoD photo by U.S. Air Force Senior Master Sgt. Adrian Cadiz